<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>tab栏切换案例</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        ul{
            list-style: none;
        }
        .wrapper{
            width: 1000px;
            height: 475px;
            margin: 0 auto;
            margin-top: 100px;
        }
        .tab{
            border: 1px solid #ddd;
            border-bottom: 0;
            height: 36px;
            width: 320px;
        }
        .tab li{
            position: relative;
            float:left;
            width: 80px;
            height: 34px;
            line-height: 34px;
            text-align: center;
            cursor: pointer;
            border-top: 4px solid #fff;
        }
        .tab span{
            position: absolute;
            right: 0;
            top: 10px;
            background-color: #ddd;
            width: 1px;
            height: 14px;
            overflow: hidden;
        }
        .products {
            width: 1002px;
            border: 1px solid #ddd;
            height: 476px;
        }
        .products .main{
            float:left;
            display: none;
        }
        .products .main.selected{
            display: block;
        }
        .tab li.active{
            border-color: red;
            border-bottom: 0;
        }
    </style>
</head>
<body>
    <div class="wrapper">
        <ul class="tab">
            <li class="tab-item active">国际大牌<span>○</span></li>
            <li class="tab-item">国装名牌<span>○</span></li>
            <li class="tab-item">清洁用品<span>○</span></li>
            <li class="tab-item">给老子爬<span>○</span></li>
        </ul>
        <div class="products">
            <div class="main selected">
                div1
            </div>
            <div class="main">
                div2
            </div>
            <div class="main">
                div3
            </div>
            <div class="main">
                div4
            </div>
        </div>
    </div>

<script src="jquery-3.3.1.min.js"></script>
<script>
    $(function () {
        $('.tab > .tab-item').mouseenter(function () {
            $(this).addClass('active').siblings().removeClass('active');
            // 获取鼠标移入的当前索引
            var idx = $(this).index();
            $('.products > .main').eq(idx).addClass('selected').siblings().removeClass('selected');
        })
    })
</script>
</body>
</html>